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  <title>Execute operation with SHARED LOCK</title>
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  <div id="layout-content"><div id="mysql-xdevapi-collectionfind.lockshared" class="refentry">
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  <h1 class="refname">CollectionFind::lockShared</h1>
  <p class="verinfo">(No version information available, might only be in Git)</p><p class="refpurpose"><span class="refname">CollectionFind::lockShared</span> &mdash; <span class="dc-title">Execute operation with SHARED LOCK</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-mysql-xdevapi-collectionfind.lockshared-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>mysql_xdevapi\CollectionFind::lockShared</strong></span>(<span class="methodparam"><span class="type">int</span> <code class="parameter">$lock_waiting_option</code><span class="initializer"> = ?</span></span>): <span class="type"><a href="class.mysql-xdevapi-collectionfind.html" class="type mysql_xdevapi\CollectionFind">mysql_xdevapi\CollectionFind</a></span></div>

  <p class="para rdfs-comment">
   Allows to share the documents between multiple transactions which are locking in shared mode.
  </p>
  <p class="para">
   Other sessions can read the rows, but cannot modify them until your transaction commits. 
  </p>
  <p class="para">
   If any of these rows were changed by another transaction that has not yet committed, 
  </p>
  <p class="para">
   your query waits until that transaction ends and then uses the latest values.
  </p>

 </div>


 <div class="refsect1 parameters" id="refsect1-mysql-xdevapi-collectionfind.lockshared-parameters">
  <h3 class="title">参数</h3>
  <dl>
   
    <dt>
<code class="parameter">lock_waiting_option</code></dt>

    <dd>

     <p class="para">
      Optional waiting option. By default it is <strong><code>MYSQLX_LOCK_DEFAULT</code></strong>. Valid values are these constants:
     </p>
     <ul class="itemizedlist">
      <li class="listitem"><p class="para"><strong><code>MYSQLX_LOCK_DEFAULT</code></strong></p></li>
      <li class="listitem"><p class="para"><strong><code>MYSQLX_LOCK_NOWAIT</code></strong></p></li>
      <li class="listitem"><p class="para"><strong><code>MYSQLX_LOCK_SKIP_LOCKED</code></strong></p></li>
     </ul>
    </dd>

   
  </dl>

 </div>


 <div class="refsect1 returnvalues" id="refsect1-mysql-xdevapi-collectionfind.lockshared-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   A CollectionFind object that can be used for further processing
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-mysql-xdevapi-collectionfind.lockshared-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="example-1582">
   <p><strong>示例 #1 <span class="function"><strong>mysql_xdevapi\CollectionFind::lockShared()</strong></span> example</strong></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$session&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">mysql_xdevapi</span><span style="color: #007700">\</span><span style="color: #0000BB">getSession</span><span style="color: #007700">(</span><span style="color: #DD0000">"mysqlx://user:password@localhost"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$schema&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$session</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getSchema</span><span style="color: #007700">(</span><span style="color: #DD0000">"addressbook"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$collection&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$schema</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">createCollection</span><span style="color: #007700">(</span><span style="color: #DD0000">"people"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$session</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">startTransaction</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">$result&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$collection<br />&nbsp;&nbsp;</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">find</span><span style="color: #007700">(</span><span style="color: #DD0000">"age&nbsp;&gt;&nbsp;50"</span><span style="color: #007700">)<br />&nbsp;&nbsp;-&gt;</span><span style="color: #0000BB">lockShared</span><span style="color: #007700">()<br />&nbsp;&nbsp;-&gt;</span><span style="color: #0000BB">execute</span><span style="color: #007700">();<br /><br /></span><span style="color: #FF8000">//&nbsp;...&nbsp;read&nbsp;the&nbsp;object&nbsp;in&nbsp;shared&nbsp;mode<br /><br />//&nbsp;Complete&nbsp;the&nbsp;transaction&nbsp;and&nbsp;unlock&nbsp;the&nbsp;document<br /></span><span style="color: #0000BB">$session</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">commit</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

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